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Note 14 - Stockholders' Equity (Detail) - Summary of warrant shares outstanding and exercised: (USD $) | 12 Months Ended
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Dec. 31, 2010 | Dec. 31, 2010 Warrants Exercised In 2010 [Member] | Dec. 31, 2011 Warrants Exercised In 2011 [Member]
Warrants Exercised Shares | 314,412 | 238,981 | 75,431
Warrants Exercised Company's Proceeds from Exercise (in Dollars) | $ 33,330 | $ 358,471 | $ 113,147
Year-End Warrant Share Balance | 334,046 | 75,431 |

X
- Definition Warrants Exercised Shares + References No definition available. + Details
Name: | strl_WarrantsExercisedShares
Namespace Prefix: | strl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_ProceedsFromWarrantExercises
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration